Wrench



Jly l, 1930. T. A. FARMER .1,768,548

WRENCH Filed Dec. 31, 192,8

IN1/EN TOR. Tam/M5 A- FARMER jm@ .WW

A TTORNEYS.

Patented July 1, 193()A narran sTA'rEs Param 7 orifice THOMAS A. FARMER, OF DUBACH, LOUISIANA, ASSIGNOR ONE-THIRD TO CYRUS E. f MILLER AND ONE-TIIIRD 'T0 WILLIAM It. MADIDEN, BOTH OF DUBACI-I, LOUISIANA Wannen. Y

Application filed December 31, 1928. Serial No. 329,387.

This invention relates to wrenches and Y more particularly to wrenches of the type Li i which will tightly grip theiwork as pressure is applied to the `handle thereofr in a predetermined direction, movement of the handle in the opposite direction tending to loosen the jaws of the wrench from engagement with the work.

A further object of the invention is-to provide a quick adjustable wrench embodying a movable jaw provided with' a shank slid able over the main shank of the wrench having a right angular extension shdably mounted in a gu1de-way in the main shank,

the main shank carrying a protected rack bar on each side of the guide way, the extension f' being provided with' a pawl engaging the r the .main shank and for associating the rackl rack bars, the main shank also being provided with a novel guide for said pawl;

A further object of the invention is the provision ofv novel means for constructing bar and the rigid jaw` therewith. p A still further object ofthe invention is yto Vprovide a wrench of the abovemcharacter,

which will be durable and eiiicient in use, one that will be simple and easy to manufacture, and, one which can be placed upon the market at a reasonable cost. Y

lith these and otherobjects in view, the

' invention consists in the novel construction, arrangement and formation of parts, as will be hereinafterk more specifically described, claimed, and illustrated in the accompanying drawing, in which drawing Figure l is a side elevationvof the inr an adjusted position.

"proved Wrench' showing the movable jaw in V Figure v2 is an edge elevation of the i wrench. Y n A Figure 3 is a fragmentary longitudinal section through my improved wrench.

'Figure 4: is a transverse section through the wrench taken on the line 4--4 of Figure 3, looking in the direction ofthe arrows, and Figure 5is a fragmentary perspective view of the` innerv end of the shank of the movable jaw 'showing the extension formedr thereon y eov and the locking pawl or jaw for connection therewith, the pawl being shown removed `from the extension. 'i i Y Referring to the drawing in detail, whereinvsimilar reference characters designate corresponding parts. throughout the several views, theletter A generally indicates my improvedwrench which' comprises a shank 10 having a handle 11 formed on the outerl end thereof. This handle 11 can have detachably associated therewith on the opposite sides thereof suitable hand grips 12.

in accordance with my invention and I pre# fer to buildl this shank of Vseparate sections, in order tol facilitate the easy assembling of `'the parts and to permit replacement to be made when parts become worn.

The shank 10 at its outer endis provided with an extension `13 which extends parallel l r1`he shank 10 is formed in a novel manner, .5

to the body portion of the shank, but at one siderof the longitudinal axis thereof. The 1 shank inward'of the extension 13 is provided with a slot 14, for a be later described.

purpose,` which will l The extension 13 of the Ishank. andthe A( body portion of the shanksupports a rigid Jaw face 15 which is'l provided with `gripping teeth 16 which are preferably arranged on the arc of a circle. The inner end of the jaw facey 15 is providedlwith an inwardly directed attaching plate or lug 17 which is fitted within a notch 18 formed in thev outer end of the extension 13 of theshank. The outer end of the jawvface 15 is provided with a retaining plate 19 which extends in' spaced parallel relation to the extension andl this plate engages and abuts the body por tion of the shank. Received in the slot 14 is the inner end ot rack bar 2O which extends along the entire face of the extension 13 and the forward end of the rack bar engages the inner face of the jawv15.

Suitable securing screws 21 are extended through the body portion ci the shank, the inner end of the rack bar 20, and the inner end of the plate 19 and through the lug 17, extension 13, and plate 19 adjacent to the on-ter -or forward end thereof. The outer or forward end of the rack bar is preferably enlarged to provide an abutment block 2Q which engages the plate 19.

Both the extensionI 13 and the rack bar 20 yare provided with slots 23 for a purpose which will be later brought out. It is to be noted-that 'the slot defines a guide-way and that the toothed portion of the rack bar 20 is spaced from the plate 19 detining asecond guide-way ,241 which extends at right angles to the slot o r guide-way 23, and .these slots kcommunicate with one another.

Jllovable toward and away from the rigid jaw 15 is a movable jaw 30, which jaw is ,provided with an inner working iface 31 having grippingteeth, which are also preferably arranged on the arc ot a circle. This movable jaw 3.0 is provided with an inwardly directed shank which slides along the outer tace of the extension 13 ot the `shank 1.0. The inner end ott the movable jaw shank 32Vis provided with an inwardlypdirected substantially right angularly disposed arm 33, which passes through the slots 23.. The innery aceof the Amovable jaw shank 3,2 at

Y its lower end thereof is arcuated to provide Aav iulcruin 341e for engaging the extension `13. Likewise the end ot the arm 33 is provided Vwith anarcuate tace 35, which is adapted to Vengage the inner tace of the plate 19 and the innerv face of this plate is preferably provided with a groove or guide channel 36 for receiving` the end of the arm 33 when the arm is swung on the ulcrum 34.

This arm 33 carriesja pawl or dog 37 which is in the nature oi a transversely extendimy pin, said 1pawl or dog being disposed througir an vopening 33, ot' the same shape as the transverse conliguration ot the pawl or dog, ,tormedin the arm it is to be noted that the pawl or dog has formed on the body portion thereof' the .longitudinally extending tooth 39. which is adapted to engage the teeth ofthe rack bar 2O.V The jaw 3,0 is preferably connected toits shank 32 by means of `a pivot pin 40, whereby the movable jaw will have a Y slight .rocking movement on its shank and relative to the rigid jaw 15.. This also allows .the renewal of the movable jaw in case the same becomesmutilated or injured in any way.` Y

In useoi';` the improved wrenchthe movable jaw shank 32 isr swung on the fulcrum 3/l whichy will move the tooth 39 of the pawl or dog 37 to allow the engagement with the teeth oit the rack bar 20, after which the movable 'jaw 30 is moved to its initial adjusted position relative to the rigid jaw 15 and in engagement with the work. rlhe aw 30 is now moved around the work to its working position (shown in Figures 1 and 3) and when the handle of the wrench is swung in a clockwise direction (referring to Figure 1 oi the dravings) `the yteeth of the rigid .and movable rjaws will grip the work and the movable jaw will be held in tight contact therewith and allow the easy turning oi the work.

When it is desired to remove the wrench from the work it is merely necessary to swing the wrench in a retrograde direction, namely a counter clockwise direction and the j aw 30 will be swung away from the work and thus allow the removal ot the wrench from the work.

From the foregoing description, it can be seen .that i have provided a .novel wrench for round work which can be `quickly adjusted on the work without the use of `feed nuts or screws which will tightly grip the work when in use. y

Changes in. detailsmay be made without `depai from the spirit or the .scope loi: this invention, leutzlwhat l claim as new is:

A wrench comprising a shank consisting of a handle iiorming one end oi the shank and an extension forming the opposite end of the shank provided with a longitudinal lot, a rack bar carried by the inner tace of said ei:- tension on each side of the slot and formed vinde-penden,t of the extension, a rigid jaw ar ranged at the outer end of the section and rack bar and secured thereto.` a plate carried by said rigid jaw extending' in parallel relation to .the shank and secured thereto inward off the rack bars, said plate forming a guard for the rack bars and defining in connection therewith a guidefway, a movabl aw, a shank for the movable iaw rockably connected therewith and slidable along the outer ace ot the first mentioned shank, a lat-erallq;7 4extending arm formed on the inner end oi5 the second mentioned shank slidably mounted in the slot and rextending into the guide-way, and a pawl carried by the inner end ot said arm extending transversely of the guide-way lto; elective engagement with the teeth oit the rack bars.

le testimony whereoi:l i atiix my signature. 

